gdb/fbsd-tdep.c

   1 /* Target-dependent code for FreeBSD, architecture-independent.
   2
   3    Copyright (C) 2002-2016 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "gdbcore.h"
  22 #include "inferior.h"
  23 #include "regcache.h"
  24 #include "regset.h"
  25 #include "gdbthread.h"
  26
  27 #include "elf-bfd.h"
  28 #include "fbsd-tdep.h"
  29
  30
  31 static int
  32 find_signalled_thread (struct thread_info *info, void *data)
  33 {
  34   if (info->suspend.stop_signal != GDB_SIGNAL_0
  35       && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid))
  36     return 1;
  37
  38   return 0;
  39 }
  40
  41 static enum gdb_signal
  42 find_stop_signal (void)
  43 {
  44   struct thread_info *info =
  45     iterate_over_threads (find_signalled_thread, NULL);
  46
  47   if (info)
  48     return info->suspend.stop_signal;
  49   else
  50     return GDB_SIGNAL_0;
  51 }
  52
  53 struct fbsd_collect_regset_section_cb_data
  54 {
  55   const struct regcache *regcache;
  56   bfd *obfd;
  57   char *note_data;
  58   int *note_size;
  59 };
  60
  61 static void
  62 fbsd_collect_regset_section_cb (const char *sect_name, int size,
  63                                 const struct regset *regset,
  64                                 const char *human_name, void *cb_data)
  65 {
  66   char *buf;
  67   struct fbsd_collect_regset_section_cb_data *data
  68     = (struct fbsd_collect_regset_section_cb_data *) cb_data;
  69
  70   gdb_assert (regset->collect_regset);
  71
  72   buf = (char *) xmalloc (size);
  73   regset->collect_regset (regset, data->regcache, -1, buf, size);
  74
  75   /* PRSTATUS still needs to be treated specially.  */
  76   if (strcmp (sect_name, ".reg") == 0)
  77     data->note_data = (char *) elfcore_write_prstatus
  78       (data->obfd, data->note_data, data->note_size,
  79        ptid_get_pid (inferior_ptid), find_stop_signal (), buf);
  80   else
  81     data->note_data = (char *) elfcore_write_register_note
  82       (data->obfd, data->note_data, data->note_size,
  83        sect_name, buf, size);
  84   xfree (buf);
  85 }
  86
  87 /* Create appropriate note sections for a corefile, returning them in
  88    allocated memory.  */
  89
  90 static char *
  91 fbsd_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, int *note_size)
  92 {
  93   struct regcache *regcache = get_current_regcache ();
  94   char *note_data;
  95   Elf_Internal_Ehdr *i_ehdrp;
  96   struct fbsd_collect_regset_section_cb_data data;
  97
  98   /* Put a "FreeBSD" label in the ELF header.  */
  99   i_ehdrp = elf_elfheader (obfd);
 100   i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
 101
 102   gdb_assert (gdbarch_iterate_over_regset_sections_p (gdbarch));
 103
 104   data.regcache = regcache;
 105   data.obfd = obfd;
 106   data.note_data = NULL;
 107   data.note_size = note_size;
 108   target_fetch_registers (regcache, -1);
 109   gdbarch_iterate_over_regset_sections (gdbarch,
 110                                         fbsd_collect_regset_section_cb,
 111                                         &data, regcache);
 112   note_data = data.note_data;
 113
 114   if (get_exec_file (0))
 115     {
 116       const char *fname = lbasename (get_exec_file (0));
 117       char *psargs = xstrdup (fname);
 118
 119       if (get_inferior_args ())
 120         psargs = reconcat (psargs, psargs, " ", get_inferior_args (),
 121                            (char *) NULL);
 122
 123       note_data = elfcore_write_prpsinfo (obfd, note_data, note_size,
 124                                           fname, psargs);
 125     }
 126
 127   return note_data;
 128 }
 129
 130 /* To be called from GDB_OSABI_FREEBSD_ELF handlers. */
 131
 132 void
 133 fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 134 {
 135   set_gdbarch_make_corefile_notes (gdbarch, fbsd_make_corefile_notes);
 136 }